I personally like my coops BIG and I'd make the run tall enough for me to walk around in, and put some random stuff out there for the chickens to climb on, maybe some nice tree branches etc., a sort of jungle gym for 'em.
I suspect this may be because when I was a kid, we had a parrot and some neighbors, the Bickels, had parrots in big aviaries, and a local tourist attraction was a place that was a HUGE aviary with double doors to keep the parrots in, and you'd walk through and give 'em sunflower seeds etc that you'd pay 25c a handful for. LOL and this was in the 70s! It's like paying a couple of bucks now!
Anyway, I like to have things so I can walk around and work in there comfortably. But then, it's a lot more hardware cloth to buy.